Sometimes, something that people are calling "political correctness" is merely "correctness", and is not political in nature at all. The statement tptacek made about Ferguson was accurate, and five minutes (or less) of Googling could have confirmed that for you.

To demand color-blind language in this circumstance is to deny the existence of systemic racism, and to make it impossible to discuss solutions. A discussion about Ferguson without acknowledgement of the racial divide in Ferguson is actively harmful to finding solutions.